In a big bowl, add the water, shortening, flour, and salt. Mix everything together until most of the water is incorporated. Then add the achiote oil and mix to distribute the color.
Place the dough on a flat surface and knead for 10 minutes. The dough should be smooth. Put the dough back in the bowl and cover with plastic wrap. Let the dough rest for 30 minutes. Make your chicken while the dough rests to save time.
Chicken filling
Cube the onion and peppers into about ¼ inch pieces. Set them aside for later.
Remove any excess fat from the chicken. Season the chicken with the adobo, sazon, chicken bouillon, oregano, and garlic paste. Mix until all the chicken is well seasoned.
In a medium-sized pan over high heat, add the oil. Add the chicken and sear for 6 minutes on each side. Reduce the heat to medium-high and add the sofrito, tomato sauce, and the onion and peppers. Mix everything, cover, and finish cooking for 8 minutes.
Use a chicken shredder to shred the chicken, or use your hand, once the chicken has cooled off.
Making the pastelillos
Lightly flour the surface and roll the dough until it is about ⅛ inch thick. Use a 4-inch round cutter or a small round dish and cut the disks. Take the scraps of dough, roll and cut again until there's no more dough left. Place each disk on wax or parchment paper to separate them.
Take one dough disk and add about 2 tablespoons of the shredded chicken in the middle. Use a fork to seal the border of the pastelillo by pressing down on it to about ¼ inch in the border. Do this until all the border is sealed. Flip the pastelillo and repeat the same process on this side of the border. You can also use an empanada press to make the closing job easier.
In a big pan, add the oil over medium-high heat. Let the oil get hot and add all your pastelillos. Fry for 2 minutes on each side or until they're golden brown. Remove from the oil onto a plate with s paper towel to absorb any excess oil. Enjoy!
Notes
Oil- I used achiote oil to give the dough color. If you don't have any, just substitute with vegetable oil.
Thighs- I used chicken thighs to make the pastelillos filling, but you can use chicken breast.
Dough- While I made the dough because it is not always easy to find it in the supermarket, of course, this depends on where you live. You can use the store-bought disk, and they're as good as the homemade.
Cutter- I used a 4-inch round cutter because I was going for small appetizer-size pastelillos. You can make them bigger by using a bigger cutter. But keep in mind that you'll get fewer portions.